Thank you!
The biggest challenge of the "confined" theme for me was definitely the hitbox size - I prefer smaller hitboxes myself but to keep in line with the theme it felt wrong to make it as small as in your average Touhou or Cave bullet hells (what's the point of you controlling a giant coffin then?), so I opted for a bigger one + health points instead of lives. Still, from my tests, about 90% of the patterns can be beaten without taking any hits or using Laser, with the remaining 10% possible but extremely hard